科研之友
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摘要
In the asymmetric unit of the title co-crystal, C12H14N4O2S﹞C7H5NO4, the sulfamethazine and 2-nitrobenzoic acid molecules form a heterodimer through intermolecular amide每carboxylic acid N〞H...O and carboxylic acid每pyrimidine O〞H...N hydrogen-bond pairs, giving a cyclic motif [graph set R22(8)]. The dihedral angle between the two aromatic ring systems in the sulfamethazine molecule is 88.96 (18)～ and the nitro group of the acid is 50% rotationally disordered. Secondary aniline N〞H...Osulfone hydrogen-bonding associations give a two-dimensional structure lying parallel to the ab plane.
